Oats contain avenocosides, which are a type of plant saponin similar to the furostanolic saponins in Tribulus. According to Flex magazine they increase the amount of luteinizing hormone (LH) released from the pituitary gland, which influences the testicles to produce more testosterone.
Avena sativa also free up testosterone from the carrier protein, sex-hormone-binding globulin (SHBG). Only free testosterone enters muscle cells to stimulate growth and boost strength gains.
Take 100-300mg of a 10:1 Avena sativa extract two or three times a day.